[JUX2] [07] Added front-end hover icon to modules to edit module in backend (with tooltip showing module position)

Related tracker: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31864&start=25


Image:
![frontend-module-edit-icon](https://f.cloud.github.com/assets/47402/771962/a7088206-e8f5-11e2-9bd2-86487c7b18a0.png)


(replaces PR https://github.com/joomla/joomla-cms/pull/2025 )